source: trunk/gcc/libjava/java/rmi/server/RemoteObject.java

/*
  Copyright (c) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
 
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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terms of your choice, provided that you also meet, for each linked
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this exception to your version of the library, but you are not
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exception statement from your version. */

package java.rmi.server;

import java.io.Serializable;
import java.rmi.Remote;
import java.rmi.NoSuchObjectException;
import java.rmi.UnmarshalException;
import java.rmi.server.RemoteRef;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.IOException;
import java.lang.ClassNotFoundException;
import java.lang.InstantiationException;
import java.lang.IllegalAccessException;
import java.lang.reflect.Constructor;

public abstract class RemoteObject
        implements Remote, Serializable {

public static final long serialVersionUID = -3215090123894869218l;

protected transient RemoteRef ref;

protected RemoteObject() {
        this(null);
}

protected RemoteObject(RemoteRef newref) {
        ref = newref;
}

public RemoteRef getRef() {
        return (ref);
}

  public static Remote toStub(Remote obj) throws NoSuchObjectException 
  {
    Class cls = obj.getClass();
    String classname = cls.getName();
    ClassLoader cl = cls.getClassLoader();
    try 
      {
        Class scls = cl.loadClass(classname + "_Stub");
        // JDK 1.2 stubs
        Class[] stubprototype = new Class[] { RemoteRef.class };
        Constructor con = scls.getConstructor(stubprototype);
        return (Remote)(con.newInstance(new Object[]{obj}));
      }
    catch (Exception e) {}
    throw new NoSuchObjectException(obj.getClass().getName());
  }

public int hashCode() {
        if (ref == null) {
                return (0);
        }
        else {
                return (ref.hashCode());
        }
}

public boolean equals(Object obj) {
        // We only compare references.
        return (this == obj);
}

  public String toString() 
  {
    if (ref == null)
      return getClass ().toString ();
    return (ref.toString ());
  }
  
  private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException 
  {
    String cname = in.readUTF();
    if (!cname.equals("")) 
      {
        if (cname.equals ("UnicastRef2"))
          { 
            // hack for interoperating with JDK
            cname = "UnicastRef";
            in.read (); //some unknown UnicastRef2 field
          }

        cname = RemoteRef.packagePrefix + '.' + cname;
        try 
          {
            Class cls = Class.forName(cname);
            ref = (RemoteRef)cls.newInstance();
          }
        catch (InstantiationException e1) 
          {
            throw new UnmarshalException("failed to create ref", e1);
          }
        catch (IllegalAccessException e2) 
          {
            throw new UnmarshalException("failed to create ref", e2);
          }
        ref.readExternal(in);
      }
    else 
      {
        ref = (RemoteRef)in.readObject();
      }
  }

private void writeObject(ObjectOutputStream out) throws IOException, ClassNotFoundException {
        if (ref == null) {
                throw new UnmarshalException("no ref to serialize");
        }
        String cname = ref.getRefClass(out);
        if (cname != null && cname.length() > 0) {
                out.writeUTF(cname);
                ref.writeExternal(out);
        }
        else {
                out.writeUTF("");
                out.writeObject(ref);
        }
}

}